KeyMint: CreateKeyMintDevice retruns shared_ptr. am: 99e4a381a1 am: 05d5e5fea0

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/2005013

Change-Id: I0f2c7c08375642cd5b9f7776d78ad702ca7b6ff9